// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/interpreter/bytecode-array-random-iterator.h"
#include "src/objects-inl.h"
#include "src/objects/code-inl.h"

namespace v8 {
namespace internal {
    namespace interpreter {

        BytecodeArrayRandomIterator::BytecodeArrayRandomIterator(
            Handle<BytecodeArray> bytecode_array, Zone* zone)
            : BytecodeArrayAccessor(bytecode_array, 0)
            , offsets_(zone)
        {
            // Run forwards through the bytecode array to determine the offset of each
            // bytecode.
            while (current_offset() < bytecode_array->length()) {
                offsets_.push_back(current_offset());
                SetOffset(current_offset() + current_bytecode_size());
            }
            GoToStart();
        }

        bool BytecodeArrayRandomIterator::IsValid() const
        {
            return current_index_ >= 0 && static_cast<size_t>(current_index_) < offsets_.size();
        }

        void BytecodeArrayRandomIterator::UpdateOffsetFromIndex()
        {
            if (IsValid()) {
                SetOffset(offsets_[current_index_]);
            }
        }

    } // namespace interpreter
} // namespace internal
} // namespace v8
